3 down
A
lot
of
figure
(5)
A lot of figure (5)
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The definition is at the beginning of the clue.
How the clue works
Right, so a lot is your definition there — that's just "frequently", i.e. OFTEN. For the wordplay, "of" gives you OF straight away, and "figure" is a number, TEN, so stick OF and TEN together and you've built the whole answer.